Added a basic vehicle status UI showing mode and a few key datapoints.

scenes/vehicle_status_demo.tscn

@@ -0,0 +1,44 @@
+[gd_scene format=3]
+
+[ext_resource type="PackedScene" path="res://components/vehicle_status_panel.tscn" id="1"]
+[ext_resource type="Script" path="res://scripts/vehicle_status_demo.gd" id="2"]
+
+[node name="VehicleStatusDemo" type="VBoxContainer"]
+offset_left = 24.0
+offset_top = 24.0
+offset_right = 624.0
+offset_bottom = 560.0
+theme_override_constants/separation = 12
+script = ExtResource("2")
+
+[node name="Notice" type="Label" parent="."]
+layout_mode = 2
+text = "SIMULATED / gauge thresholds are provisional"
+
+[node name="VehicleStatusPanel" parent="." instance=ExtResource("1")]
+layout_mode = 2
+
+[node name="Controls" type="HBoxContainer" parent="."]
+layout_mode = 2
+
+[node name="State" type="OptionButton" parent="Controls"]
+layout_mode = 2
+item_count = 4
+selected = 0
+popup/item_0/text = "Normal"
+popup/item_0/id = 0
+popup/item_1/text = "Warning"
+popup/item_1/id = 1
+popup/item_2/text = "Fault"
+popup/item_2/id = 2
+popup/item_3/text = "Stop feed / stale"
+popup/item_3/id = 3
+
+[node name="Contrast" type="CheckButton" parent="Controls"]
+layout_mode = 2
+text = "High contrast"
+
+[node name="Pulse" type="CheckButton" parent="Controls"]
+layout_mode = 2
+text = "Pulse"
+button_pressed = true